Hey Don... From my perspective your describing the signs of an over current problem,where start-up current exceeds the over current trip level of the inverter. Output voltage should quickly decrease in order to limit the output current. Where a trip level is continuously exceeded, the inverter should shut down and restart. Multiples within a short time frame should force a complete shut down of the unit. Your 400 amp fuse on the 4-0 conductor blowing is another sign of this. It doesn't sound like you have a large draw though. Could your problems be with the wiring on the DC side? Some things to check . Is your wire run under 10 feet from the inverter to battery? Are all battery interconnections of the same 4-0 gauge. Are all connections of battery cable to battery/inverter terminals direct and of good contact?
Good luck.
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2018 Four Winds 31Y
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